Dockerfile for the creation of a GitHub Actions runner image to be deployed dynamically. Find the full explanation and tutorial here.
When running the docker image, or when executing docker compose, environment variables for repo-owner/repo-name and github-token must be included.
Credit to testdriven.io for the original start.sh script, which I slightly modified to make it work with a regular repository rather than with an enterprise.
Whene generating your GitHub PAT you will need to include repo, workflow, and admin:org permissions.